The trouble with the .gov inflation calculator is that dear .gov keeps changing the rules as to how inflation is calculated.
They have to do this to keep us senior citizens who depend on SSI from keeping up with the cost of living.
Use a calculator of your choice. But if I linked to another one, someone would be complaining that I didn’t use the “official” one.
The point still stands. There was an assertion that $1.25 in 1960 would be around $15 today. That assertion was false; it would be just over $10 today.